Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A transmitting method comprising: generating a frame by allocating time-frequency resources to a plurality of data symbol groups; inserting pilot signals into the frame; generating an orthogonal frequency-division multiplexing (OFDM) signal by performing an Inverse Fast Fourier Transform (IFFT) process to the pilot inserted frame; and transmitting the OFDM signal, wherein the frame includes a preamble and the plurality of data symbol groups, to each of the plurality of data symbol groups, time-frequency resources corresponding to a part of frequency among an entirety of the frequency of the frame is allocated, and the preamble carries control information, for each of the plurality of data symbol groups, specifying the time-frequency resources allocated to the data symbol group, the control information of each data symbol group indicates at least a head position in time, a head position in frequency and the number of time resources, of the time-frequency resources allocated to the data symbol group in the frame.
This invention relates to wireless communication systems, specifically methods for transmitting data using orthogonal frequency-division multiplexing (OFDM). The problem addressed is efficient resource allocation and signal transmission in OFDM-based systems, particularly in scenarios requiring flexible and dynamic allocation of time-frequency resources. The method involves generating a frame by allocating time-frequency resources to multiple data symbol groups. Each data symbol group is assigned a portion of the available frequency spectrum, rather than the entire bandwidth. A preamble is included in the frame to carry control information that specifies the allocated time-frequency resources for each data symbol group. The control information indicates the head position in time, the head position in frequency, and the number of time resources allocated to each group. Pilot signals are inserted into the frame to aid in synchronization and channel estimation. The frame undergoes an Inverse Fast Fourier Transform (IFFT) process to generate an OFDM signal, which is then transmitted. This approach allows for flexible and efficient use of the available spectrum, enabling dynamic allocation of resources to different data symbol groups within the same frame. The preamble ensures that the receiver can accurately identify and decode the data symbol groups based on the control information provided. The inclusion of pilot signals further enhances the reliability of the transmission by aiding in synchronization and channel estimation.
2. A receiving method comprising: receiving an orthogonal frequency-division multiplexing (OFDM) signal, where the OFDM signal is generated by inserting pilot signals into a frame and performing an Inverse Fast Fourier Transform (IFFT) process to the pilot inserted frame, the frame includes a preamble and a plurality of data symbol groups, to each of the plurality of data symbol groups, time-frequency resources corresponding to a part of frequency among an entirety of the frequency of the frame is allocated, and the preamble carries control information, for each of the plurality of data symbol groups, specifying the time-frequency resources allocated to the data symbol group; acquiring the control information from the preamble; and demodulating at least one of the plurality of data symbol groups based on the control information, wherein the control information of each data symbol group indicates at least a head position of time, a head position of frequency and the number of time resources, of the time-frequency resources allocated to the data symbol group in the frame.
This invention relates to wireless communication systems using Orthogonal Frequency-Division Multiplexing (OFDM) and addresses the challenge of efficiently allocating and demodulating data in OFDM frames. The method involves receiving an OFDM signal constructed by inserting pilot signals into a frame, which undergoes an Inverse Fast Fourier Transform (IFFT) process. The frame consists of a preamble and multiple data symbol groups. Each data symbol group is assigned time-frequency resources covering only a portion of the frame's total frequency bandwidth. The preamble contains control information that specifies the time-frequency resources allocated to each data symbol group, including the time head position, frequency head position, and the number of time resources. The receiver extracts this control information from the preamble and uses it to demodulate the relevant data symbol groups. This approach enables flexible and efficient resource allocation, improving spectral efficiency and reducing interference in OFDM-based communication systems. The method ensures that the receiver can accurately identify and process the allocated resources for each data symbol group, enhancing overall system performance.
3. A transmitting apparatus comprising: a frame configuring circuitry, that in operation, generates a frame by allocating time-frequency resources to a plurality of data symbol groups; a signal processing circuitry, that in operation, inserts pilot signals into the frame and generates an orthogonal frequency-division multiplexing (OFDM) signal by performing an Inverse Fast Fourier Transform (IFFT) process to the pilot inserted frame; and transmitting circuitry, that in operation, transmits the OFDM signal, wherein the frame includes a preamble and the plurality of data symbol groups, to each of the plurality of data symbol groups, time-frequency resources corresponding to a part of frequency among an entirety of the frequency of the frame is allocated, and the preamble carries control information, for each of the plurality of data symbol groups, specifying the time-frequency resources allocated to the data symbol group, the control information of each data symbol group indicates at least a head position in time, a head position in frequency and the number of time resources, of the time-frequency resources allocated to the data symbol group in the frame.
This invention relates to wireless communication systems, specifically to a transmitting apparatus for generating and transmitting orthogonal frequency-division multiplexing (OFDM) signals with efficient resource allocation. The apparatus addresses the challenge of optimizing time-frequency resource allocation in wireless transmissions to improve spectral efficiency and reduce interference. The transmitting apparatus includes frame configuring circuitry that generates a frame by allocating time-frequency resources to multiple data symbol groups. Each data symbol group is assigned a portion of the total available frequency bandwidth, rather than the entire bandwidth, allowing for flexible and efficient resource utilization. The frame consists of a preamble and the data symbol groups, with the preamble carrying control information that specifies the allocated time-frequency resources for each data symbol group. This control information includes the head position in time, the head position in frequency, and the number of time resources allocated to each group. Signal processing circuitry inserts pilot signals into the frame and generates an OFDM signal by performing an Inverse Fast Fourier Transform (IFFT) process on the pilot-inserted frame. The transmitting circuitry then transmits the OFDM signal. The preamble's control information ensures that receiving devices can accurately decode the transmitted data by identifying the specific time-frequency resources allocated to each data symbol group. This approach enhances spectral efficiency and reduces interference by dynamically allocating resources based on channel conditions and data requirements.
4. A receiving apparatus comprising: receiving circuitry, that in operation, receives an orthogonal frequency-division multiplexing (OFDM) signal, where the OFDM signal is generated by inserting pilot signals into a frame and performing an Inverse Fast Fourier Transform (IFFT) process to the pilot inserted frame, the frame includes a preamble and a plurality of data symbol groups, to each of the plurality of data symbol groups, time-frequency resources corresponding to a part of frequency among an entirety of the frequency of the frame is allocated, and the preamble carries control information, for each of the plurality of data symbol groups, specifying the time-frequency resources allocated to the data symbol group; a preamble processing circuitry, that in operation, acquires the control information from the preamble; and a demodulating circuitry, that in operation, demodulates at least one of the plurality of data symbol groups based on the control information, wherein the control information of each data symbol group indicates at least a head position of time, a head position of frequency and the number of time resources, of the time-frequency resources allocated to the data symbol group in the frame.
The invention relates to a receiving apparatus for processing orthogonal frequency-division multiplexing (OFDM) signals, addressing the challenge of efficiently allocating and demodulating data symbol groups in a frame structure. The OFDM signal is generated by inserting pilot signals into a frame, which includes a preamble and multiple data symbol groups. Each data symbol group is allocated time-frequency resources corresponding to a portion of the frame's total frequency bandwidth. The preamble carries control information specifying the allocated time-frequency resources for each data symbol group, including the head position in time, the head position in frequency, and the number of time resources. The receiving apparatus includes circuitry to receive the OFDM signal, extract the control information from the preamble, and demodulate the data symbol groups based on the extracted control information. This approach enables flexible and efficient resource allocation in OFDM-based communication systems, improving data transmission and reception efficiency.
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February 11, 2020
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